This directory contains rel12


src.rel12 - full source for.  Make sure 
		  53c8xx_d,h and 53c8xx_u.h have a newer time stamp
		  than 53c7,8xx.scr if you don't have PERL.

If you're running these patches, you should be subscribed to the 
ncr mailing list, where patches, etc. are posted.  To subscribe,
send mail to 

	majordomo@Colorado.EDU

with 

	subscribe ncr53c810

in the text of the message.

The current sources support disconnect/reconnect, multiple commands 
per LUN, and synchronous SCSI.  

To get synchronous transfers, you must have OPTION_SYNCHRONOUS included
in the PERM_OPTIONS defined.  You can either add OPTION_ALLWAYS_SYNCHRONOUS
to PERM_OPTIONS, or call

	request_synchronous (host #, target)

from within kgdb, for each target you want sychronous transfers with.

If you experience errors on the first SCSI command to old devices, you'll
want to add

      OPTION_NO_ASYNC

to PERM_OPTIONS.

By default, disconnect/reconnect is enabled.  To change this, you can 
remove OPTION_DISCONNECT from PERM_OPTIONS, or you can call

      request_disconnect (host #, non-zero to allow or 0 to disallow)

from within kgdb.

If you really want to run 10MHz FAST SCSI-II transfers, you should know 
that the NCR driver currently ignores parity information.  Most systems 
do 5MHz SCSI fine.  I've seen a lot that have problems faster than 8MHz.  
For this reason, 5 MHz is the default synchronous transfer rate.  If 
you insist on changing it, edit sdtr_message and change the fourth 
byte to be the period you want in units of 4ns; 25 would be 10 MHz,  
50 5 MHz.


From a user perspective, the big differences from rel11+ are

	- The race condition in to_start queue is gone, 
	    so any value of cmd_per_lun should work on
	    all systems.

	- If we have a problem initializing one NCR board,
	    we'll keep looking for more.

	- The ALPHA / RISC changes have been integrated.  It 
	    appears to still work for i86 PCs, and may even
	    work for ALPHAs.

There were also minor changes made which will ultimately be used
for WIDE SCSI support and allowing users to specify synchronous 
parameters on a per-target basis.